[M.D. Holloway]

You would be surprised how many U-joints fail due to improper lubricating. With a plain bearing underlubrication is one of the more typical failure modes, then extreme loads, heat and contamination. Sometimes the load is severe but in most cases the joint is designed for it unless the tech installed the wrong unit.

When it comes to failure - can only be from 1 or a combo of 4 sources - the man, the method, the machine or the material. After that, the sources become pretty obvious with a little investigation.

I found out a few minutes ago that this guys techs do not grease the joints but once a month but when they do they do not whip off the fittings so essentially they inject in road grit right into the bearings. Sounds simple and stupid but I could show you a whole room full of stupid some day! I have a huge collection of failed parts due to stupid...